<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h2>Welcome !!!</h2>
<form action="user/add" method="post"card>
    Name: <input type="text" name="userName" value="wangl"/><br>
    Age: <input type="text" name="age" value="21"/><br>
    Card: <input type="text" name="card.cardNum" value="543543543"/><br>
    <input type="submit" value="提交"/>
</form>
</body>
</html>